10 TABLE OF CONTENTS CHAPTER 1 Earth's Kee 4 18 CHAPTER 2 What Do They Do CHAPTER 3 Become One ACTIVITIES TOOLS Try This Glossary Index To Learn More 22 23 24 24
CHAPTER 1 EARTH'S KEEPERS We only get one Earth We must take care of it Some people do this every day Who 4 CHAPTER 1
Environmental engineers They are keepers of the environment They use science and engineering to care for Earth How CHAPTER 1
